Precision CNC Machined from high quality aluminum, our steering knuckles feature all the details of the stock plastic pieces, but with improved durability and the larger 6x15mm outer bearing (included). Also compatible with the new E-Maxx, T-Maxx 3.3, E-Revo, Summit, and Slayer. We believe this is arguably one of the best CNC machined, high quality steering knuckles on the market for your Traxxas monster trucks.